旧料对沥青混合料力学特性的影响
发布时间：2019-06-17 19:43
【摘要】：为了更精细地分析旧料对沥青混合料性能的影响,将旧料采用4.75 mm的筛网热筛分为粗、细两个部分,通过掺加不同比例的粗、细旧料组成6种级配的沥青混合料进行间接拉伸模量试验和劈裂强度试验,采用不同荷载频率的间接拉伸劲度模量、冻融前后的劈裂强度、破坏应变、黏韧性指数等指标评价了旧料对沥青混合料力学特性的影响。研究表明:低频率下的劲度模量、黏韧性指标、冻融前后的劈裂强度比可以作为掺加旧料沥青混合料力学特性的评价指标;旧料中与沥青混合料力学特性存在相关性的主要是旧沥青含量,旧沥青含量越高,沥青混合料拉伸劲度模量越大,黏韧性指数越小,冻融前后的劈裂强度比越小,力学特性越差。
[Abstract]:In order to analyze the influence of old material on the performance of asphalt mixture, the screen thermal screening of old material with 4.75 mm was divided into two parts: coarse and fine. Indirect tensile modulus test and split strength test were carried out by adding six kinds of asphalt mixture with different proportion of coarse and fine old material. Indirect tensile stiffness modulus of different load frequency, split strength before and after freeze-thaw and failure strain were adopted. The effect of old material on the mechanical properties of asphalt mixture was evaluated by viscosity toughness index and other indexes. The results show that the stiffness modulus, viscosity toughness index and split strength ratio before and after freeze-thaw can be used as the evaluation index of mechanical properties of asphalt mixture mixed with old asphalt, and the mechanical properties of asphalt mixture are mainly related to the mechanical properties of asphalt mixture. The higher the old asphalt content, the greater the tensile stiffness modulus and viscosity toughness index of asphalt mixture, and the smaller the split strength ratio before and after freeze-thaw, the worse the mechanical properties.
【作者单位】： 南京林业大学土木工程学院;
【基金】：国家自然科学基金项目(51308303) 住房城乡建设部科学技术项目(2015-K4-017) 南京林业大学高层次人才科研启动基金项目(G2014014)
【分类号】：U414
[Abstract]:In order to analyze the influence of old material on the performance of asphalt mixture, the screen thermal screening of old material with 4.75 mm was divided into two parts: coarse and fine. Indirect tensile modulus test and split strength test were carried out by adding six kinds of asphalt mixture with different proportion of coarse and fine old material. Indirect tensile stiffness modulus of different load frequency, split strength before and after freeze-thaw and failure strain were adopted. The effect of old material on the mechanical properties of asphalt mixture was evaluated by viscosity toughness index and other indexes. The results show that the stiffness modulus, viscosity toughness index and split strength ratio before and after freeze-thaw can be used as the evaluation index of mechanical properties of asphalt mixture mixed with old asphalt, and the mechanical properties of asphalt mixture are mainly related to the mechanical properties of asphalt mixture. The higher the old asphalt content, the greater the tensile stiffness modulus and viscosity toughness index of asphalt mixture, and the smaller the split strength ratio before and after freeze-thaw, the worse the mechanical properties.
【作者单位】： 南京林业大学土木工程学院;
【基金】：国家自然科学基金项目(51308303) 住房城乡建设部科学技术项目(2015-K4-017) 南京林业大学高层次人才科研启动基金项目(G2014014)
【分类号】：U414
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1 张U，
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